It's heras fencing and if installed correctly should be difficult to move. I've got zero tolerance for this due to working with the commercial development industry, it costs projects tens of thousands dealing with security and damages caused to said security. Now I'm not saying this is all down to urbex at all, I'm fully aware of the "code" and even like some of the stuff. It just gets my goat when people think it's perfectly acceptable to break into private property, this wasn't a simple walk in access property, and lets not even think about the police money/time/resources wasted on this.